Monty Python and the Holy Grail is a 1975 British surreal comedy film written and performed by the comedy group of Monty Python (Graham Chapman, John Cleese, Terry Gilliam, Eric Idle, Terry Jones, and Michael Palin), and directed by Gilliam and Jones. It was conceived during the hiatus between the third and fourth series of their popular BBC television programme Monty Python's Flying Circus. Wikipedia
(the Black Knight continues to threaten Arthur despite getting both his arms and one of his legs cut off)
Black Knight: Right, I'll do you for that!
King Arthur: You'll what?
Black Knight: Come here!
King Arthur: What are you gonna do, bleed on me?
Black Knight: I'm invincible!
King Arthur: ...You're a loony.